After watching the demo, I'm going to have to side with haxor on this one. The maser made the difference in both of his wall shots. The first time he tested the corner (right around 28000) the maser activated. I'd test it too. Shit, once when I was vaga, I unloaded a full clip in that corner for shits and giggles and got a kill out of it. It's a wise player move. The jump from where he is shooting to where he finds out the person is at is reactionary as well. 99% of his traces follow a doorframe method where he aims at the corner the entire time so that he doesn't have to actively aim if someone pops out, just keep strafing. If there are any specific ticks that confuse anyone to why I'm picking my side, just ask.
As always, these are just my opinions where it's all made up and the points don't matter. Just like a strippers name.